2 * drivers/pci/pci-sysfs.c
4 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2002-2004 IBM Corp.
6 * (C) Copyright 2003 Matthew Wilcox
7 * (C) Copyright 2003 Hewlett-Packard
8 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
9 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
11 * File attributes for PCI devices
13 * Modeled after usb's driverfs.c
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/pci.h>
21 #include <linux/stat.h>
22 #include <linux/export.h>
23 #include <linux/topology.h>
26 #include <linux/capability.h>
27 #include <linux/security.h>
28 #include <linux/pci-aspm.h>
29 #include <linux/slab.h>
30 #include <linux/vgaarb.h>
31 #include <linux/pm_runtime.h>
34 static int sysfs_initialized; /* = 0 */
36 /* show configuration fields */
37 #define pci_config_attr(field, format_string) \
39 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
41 struct pci_dev *pdev; \
43 pdev = to_pci_dev (dev); \
44 return sprintf (buf, format_string, pdev->field); \
47 pci_config_attr(vendor, "0x%04x\n");
48 pci_config_attr(device, "0x%04x\n");
49 pci_config_attr(subsystem_vendor, "0x%04x\n");
50 pci_config_attr(subsystem_device, "0x%04x\n");
51 pci_config_attr(class, "0x%06x\n");
52 pci_config_attr(irq, "%u\n");
54 static ssize_t broken_parity_status_show(struct device *dev,
55 struct device_attribute *attr,
58 struct pci_dev *pdev = to_pci_dev(dev);
59 return sprintf (buf, "%u\n", pdev->broken_parity_status);
62 static ssize_t broken_parity_status_store(struct device *dev,
63 struct device_attribute *attr,
64 const char *buf, size_t count)
66 struct pci_dev *pdev = to_pci_dev(dev);
69 if (kstrtoul(buf, 0, &val) < 0)
72 pdev->broken_parity_status = !!val;
77 static ssize_t local_cpus_show(struct device *dev,
78 struct device_attribute *attr, char *buf)
80 const struct cpumask *mask;
84 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
85 cpumask_of_node(dev_to_node(dev));
87 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
89 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
96 static ssize_t local_cpulist_show(struct device *dev,
97 struct device_attribute *attr, char *buf)
99 const struct cpumask *mask;
103 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
104 cpumask_of_node(dev_to_node(dev));
106 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
108 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
115 * PCI Bus Class Devices
117 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
119 struct device_attribute *attr,
123 const struct cpumask *cpumask;
125 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
127 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
128 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
134 static ssize_t cpuaffinity_show(struct device *dev,
135 struct device_attribute *attr, char *buf)
137 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
139 static DEVICE_ATTR_RO(cpuaffinity);
141 static ssize_t cpulistaffinity_show(struct device *dev,
142 struct device_attribute *attr, char *buf)
144 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
146 static DEVICE_ATTR_RO(cpulistaffinity);
150 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
152 struct pci_dev * pci_dev = to_pci_dev(dev);
156 resource_size_t start, end;
158 if (pci_dev->subordinate)
159 max = DEVICE_COUNT_RESOURCE;
161 max = PCI_BRIDGE_RESOURCES;
163 for (i = 0; i < max; i++) {
164 struct resource *res = &pci_dev->resource[i];
165 pci_resource_to_user(pci_dev, i, res, &start, &end);
166 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
167 (unsigned long long)start,
168 (unsigned long long)end,
169 (unsigned long long)res->flags);
174 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
176 struct pci_dev *pci_dev = to_pci_dev(dev);
178 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
179 pci_dev->vendor, pci_dev->device,
180 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
181 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
182 (u8)(pci_dev->class));
185 static ssize_t is_enabled_store(struct device *dev,
186 struct device_attribute *attr, const char *buf,
189 struct pci_dev *pdev = to_pci_dev(dev);
191 ssize_t result = kstrtoul(buf, 0, &val);
196 /* this can crash the machine when done on the "wrong" device */
197 if (!capable(CAP_SYS_ADMIN))
201 if (pci_is_enabled(pdev))
202 pci_disable_device(pdev);
206 result = pci_enable_device(pdev);
208 return result < 0 ? result : count;
211 static ssize_t is_enabled_show(struct device *dev,
212 struct device_attribute *attr, char *buf)
214 struct pci_dev *pdev;
216 pdev = to_pci_dev (dev);
217 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
222 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
224 return sprintf (buf, "%d\n", dev->numa_node);
229 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
231 struct pci_dev *pdev = to_pci_dev(dev);
233 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
237 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
240 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
244 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
246 struct pci_dev *pdev = to_pci_dev(dev);
248 if (!pdev->subordinate)
251 return sprintf (buf, "%u\n",
252 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
256 msi_bus_store(struct device *dev, struct device_attribute *attr,
257 const char *buf, size_t count)
259 struct pci_dev *pdev = to_pci_dev(dev);
262 if (kstrtoul(buf, 0, &val) < 0)
265 /* bad things may happen if the no_msi flag is changed
266 * while some drivers are loaded */
267 if (!capable(CAP_SYS_ADMIN))
270 /* Maybe pci devices without subordinate busses shouldn't even have this
271 * attribute in the first place? */
272 if (!pdev->subordinate)
275 /* Is the flag going to change, or keep the value it already had? */
276 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
278 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
280 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
281 " bad things could happen\n", val ? "" : " not");
287 static DEFINE_MUTEX(pci_remove_rescan_mutex);
288 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
292 struct pci_bus *b = NULL;
294 if (kstrtoul(buf, 0, &val) < 0)
298 mutex_lock(&pci_remove_rescan_mutex);
299 while ((b = pci_find_next_bus(b)) != NULL)
301 mutex_unlock(&pci_remove_rescan_mutex);
305 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
307 struct attribute *pci_bus_attrs[] = {
308 &bus_attr_rescan.attr,
312 static const struct attribute_group pci_bus_group = {
313 .attrs = pci_bus_attrs,
316 const struct attribute_group *pci_bus_groups[] = {
322 dev_rescan_store(struct device *dev, struct device_attribute *attr,
323 const char *buf, size_t count)
326 struct pci_dev *pdev = to_pci_dev(dev);
328 if (kstrtoul(buf, 0, &val) < 0)
332 mutex_lock(&pci_remove_rescan_mutex);
333 pci_rescan_bus(pdev->bus);
334 mutex_unlock(&pci_remove_rescan_mutex);
338 struct device_attribute dev_rescan_attr = __ATTR(rescan, (S_IWUSR|S_IWGRP),
339 NULL, dev_rescan_store);
341 static void remove_callback(struct device *dev)
343 struct pci_dev *pdev = to_pci_dev(dev);
345 mutex_lock(&pci_remove_rescan_mutex);
346 pci_stop_and_remove_bus_device(pdev);
347 mutex_unlock(&pci_remove_rescan_mutex);
351 remove_store(struct device *dev, struct device_attribute *dummy,
352 const char *buf, size_t count)
357 if (kstrtoul(buf, 0, &val) < 0)
360 /* An attribute cannot be unregistered by one of its own methods,
361 * so we have to use this roundabout approach.
364 ret = device_schedule_callback(dev, remove_callback);
369 struct device_attribute dev_remove_attr = __ATTR(remove, (S_IWUSR|S_IWGRP),
373 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
374 const char *buf, size_t count)
377 struct pci_bus *bus = to_pci_bus(dev);
379 if (kstrtoul(buf, 0, &val) < 0)
383 mutex_lock(&pci_remove_rescan_mutex);
384 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
385 pci_rescan_bus_bridge_resize(bus->self);
388 mutex_unlock(&pci_remove_rescan_mutex);
392 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
394 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
395 static ssize_t d3cold_allowed_store(struct device *dev,
396 struct device_attribute *attr,
397 const char *buf, size_t count)
399 struct pci_dev *pdev = to_pci_dev(dev);
402 if (kstrtoul(buf, 0, &val) < 0)
405 pdev->d3cold_allowed = !!val;
406 pm_runtime_resume(dev);
411 static ssize_t d3cold_allowed_show(struct device *dev,
412 struct device_attribute *attr, char *buf)
414 struct pci_dev *pdev = to_pci_dev(dev);
415 return sprintf (buf, "%u\n", pdev->d3cold_allowed);
419 #ifdef CONFIG_PCI_IOV
420 static ssize_t sriov_totalvfs_show(struct device *dev,
421 struct device_attribute *attr,
424 struct pci_dev *pdev = to_pci_dev(dev);
426 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
430 static ssize_t sriov_numvfs_show(struct device *dev,
431 struct device_attribute *attr,
434 struct pci_dev *pdev = to_pci_dev(dev);
436 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
440 * num_vfs > 0; number of VFs to enable
441 * num_vfs = 0; disable all VFs
443 * Note: SRIOV spec doesn't allow partial VF
444 * disable, so it's all or none.
446 static ssize_t sriov_numvfs_store(struct device *dev,
447 struct device_attribute *attr,
448 const char *buf, size_t count)
450 struct pci_dev *pdev = to_pci_dev(dev);
454 ret = kstrtou16(buf, 0, &num_vfs);
458 if (num_vfs > pci_sriov_get_totalvfs(pdev))
461 if (num_vfs == pdev->sriov->num_VFs)
462 return count; /* no change */
464 /* is PF driver loaded w/callback */
465 if (!pdev->driver || !pdev->driver->sriov_configure) {
466 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
472 ret = pdev->driver->sriov_configure(pdev, 0);
479 if (pdev->sriov->num_VFs) {
480 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
481 pdev->sriov->num_VFs, num_vfs);
485 ret = pdev->driver->sriov_configure(pdev, num_vfs);
490 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
496 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
497 static struct device_attribute sriov_numvfs_attr =
498 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
499 sriov_numvfs_show, sriov_numvfs_store);
500 #endif /* CONFIG_PCI_IOV */
502 struct device_attribute pci_dev_attrs[] = {
506 __ATTR_RO(subsystem_vendor),
507 __ATTR_RO(subsystem_device),
510 __ATTR_RO(local_cpus),
511 __ATTR_RO(local_cpulist),
514 __ATTR_RO(numa_node),
516 __ATTR_RO(dma_mask_bits),
517 __ATTR_RO(consistent_dma_mask_bits),
518 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
519 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
520 broken_parity_status_show,broken_parity_status_store),
521 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
522 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
523 __ATTR(d3cold_allowed, 0644, d3cold_allowed_show, d3cold_allowed_store),
528 static struct attribute *pcibus_attrs[] = {
529 &dev_attr_rescan.attr,
530 &dev_attr_cpuaffinity.attr,
531 &dev_attr_cpulistaffinity.attr,
535 static const struct attribute_group pcibus_group = {
536 .attrs = pcibus_attrs,
539 const struct attribute_group *pcibus_groups[] = {
545 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
547 struct pci_dev *pdev = to_pci_dev(dev);
548 struct pci_dev *vga_dev = vga_default_device();
551 return sprintf(buf, "%u\n", (pdev == vga_dev));
553 return sprintf(buf, "%u\n",
554 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
555 IORESOURCE_ROM_SHADOW));
557 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
560 pci_read_config(struct file *filp, struct kobject *kobj,
561 struct bin_attribute *bin_attr,
562 char *buf, loff_t off, size_t count)
564 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
565 unsigned int size = 64;
566 loff_t init_off = off;
567 u8 *data = (u8*) buf;
569 /* Several chips lock up trying to read undefined config space */
570 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
571 size = dev->cfg_size;
572 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
578 if (off + count > size) {
585 pci_config_pm_runtime_get(dev);
587 if ((off & 1) && size) {
589 pci_user_read_config_byte(dev, off, &val);
590 data[off - init_off] = val;
595 if ((off & 3) && size > 2) {
597 pci_user_read_config_word(dev, off, &val);
598 data[off - init_off] = val & 0xff;
599 data[off - init_off + 1] = (val >> 8) & 0xff;
606 pci_user_read_config_dword(dev, off, &val);
607 data[off - init_off] = val & 0xff;
608 data[off - init_off + 1] = (val >> 8) & 0xff;
609 data[off - init_off + 2] = (val >> 16) & 0xff;
610 data[off - init_off + 3] = (val >> 24) & 0xff;
617 pci_user_read_config_word(dev, off, &val);
618 data[off - init_off] = val & 0xff;
619 data[off - init_off + 1] = (val >> 8) & 0xff;
626 pci_user_read_config_byte(dev, off, &val);
627 data[off - init_off] = val;
632 pci_config_pm_runtime_put(dev);
638 pci_write_config(struct file* filp, struct kobject *kobj,
639 struct bin_attribute *bin_attr,
640 char *buf, loff_t off, size_t count)
642 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
643 unsigned int size = count;
644 loff_t init_off = off;
645 u8 *data = (u8*) buf;
647 if (off > dev->cfg_size)
649 if (off + count > dev->cfg_size) {
650 size = dev->cfg_size - off;
654 pci_config_pm_runtime_get(dev);
656 if ((off & 1) && size) {
657 pci_user_write_config_byte(dev, off, data[off - init_off]);
662 if ((off & 3) && size > 2) {
663 u16 val = data[off - init_off];
664 val |= (u16) data[off - init_off + 1] << 8;
665 pci_user_write_config_word(dev, off, val);
671 u32 val = data[off - init_off];
672 val |= (u32) data[off - init_off + 1] << 8;
673 val |= (u32) data[off - init_off + 2] << 16;
674 val |= (u32) data[off - init_off + 3] << 24;
675 pci_user_write_config_dword(dev, off, val);
681 u16 val = data[off - init_off];
682 val |= (u16) data[off - init_off + 1] << 8;
683 pci_user_write_config_word(dev, off, val);
689 pci_user_write_config_byte(dev, off, data[off - init_off]);
694 pci_config_pm_runtime_put(dev);
700 read_vpd_attr(struct file *filp, struct kobject *kobj,
701 struct bin_attribute *bin_attr,
702 char *buf, loff_t off, size_t count)
704 struct pci_dev *dev =
705 to_pci_dev(container_of(kobj, struct device, kobj));
707 if (off > bin_attr->size)
709 else if (count > bin_attr->size - off)
710 count = bin_attr->size - off;
712 return pci_read_vpd(dev, off, count, buf);
716 write_vpd_attr(struct file *filp, struct kobject *kobj,
717 struct bin_attribute *bin_attr,
718 char *buf, loff_t off, size_t count)
720 struct pci_dev *dev =
721 to_pci_dev(container_of(kobj, struct device, kobj));
723 if (off > bin_attr->size)
725 else if (count > bin_attr->size - off)
726 count = bin_attr->size - off;
728 return pci_write_vpd(dev, off, count, buf);
731 #ifdef HAVE_PCI_LEGACY
733 * pci_read_legacy_io - read byte(s) from legacy I/O port space
734 * @filp: open sysfs file
735 * @kobj: kobject corresponding to file to read from
736 * @bin_attr: struct bin_attribute for this file
737 * @buf: buffer to store results
738 * @off: offset into legacy I/O port space
739 * @count: number of bytes to read
741 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
742 * callback routine (pci_legacy_read).
745 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
746 struct bin_attribute *bin_attr,
747 char *buf, loff_t off, size_t count)
749 struct pci_bus *bus = to_pci_bus(container_of(kobj,
753 /* Only support 1, 2 or 4 byte accesses */
754 if (count != 1 && count != 2 && count != 4)
757 return pci_legacy_read(bus, off, (u32 *)buf, count);
761 * pci_write_legacy_io - write byte(s) to legacy I/O port space
762 * @filp: open sysfs file
763 * @kobj: kobject corresponding to file to read from
764 * @bin_attr: struct bin_attribute for this file
765 * @buf: buffer containing value to be written
766 * @off: offset into legacy I/O port space
767 * @count: number of bytes to write
769 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
770 * callback routine (pci_legacy_write).
773 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
774 struct bin_attribute *bin_attr,
775 char *buf, loff_t off, size_t count)
777 struct pci_bus *bus = to_pci_bus(container_of(kobj,
780 /* Only support 1, 2 or 4 byte accesses */
781 if (count != 1 && count != 2 && count != 4)
784 return pci_legacy_write(bus, off, *(u32 *)buf, count);
788 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
789 * @filp: open sysfs file
790 * @kobj: kobject corresponding to device to be mapped
791 * @attr: struct bin_attribute for this file
792 * @vma: struct vm_area_struct passed to mmap
794 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
795 * legacy memory space (first meg of bus space) into application virtual
799 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
800 struct bin_attribute *attr,
801 struct vm_area_struct *vma)
803 struct pci_bus *bus = to_pci_bus(container_of(kobj,
807 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
811 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
812 * @filp: open sysfs file
813 * @kobj: kobject corresponding to device to be mapped
814 * @attr: struct bin_attribute for this file
815 * @vma: struct vm_area_struct passed to mmap
817 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
818 * legacy IO space (first meg of bus space) into application virtual
819 * memory space. Returns -ENOSYS if the operation isn't supported
822 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
823 struct bin_attribute *attr,
824 struct vm_area_struct *vma)
826 struct pci_bus *bus = to_pci_bus(container_of(kobj,
830 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
834 * pci_adjust_legacy_attr - adjustment of legacy file attributes
835 * @b: bus to create files under
836 * @mmap_type: I/O port or memory
838 * Stub implementation. Can be overridden by arch if necessary.
841 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
847 * pci_create_legacy_files - create legacy I/O port and memory files
848 * @b: bus to create files under
850 * Some platforms allow access to legacy I/O port and ISA memory space on
851 * a per-bus basis. This routine creates the files and ties them into
852 * their associated read, write and mmap files from pci-sysfs.c
854 * On error unwind, but don't propagate the error to the caller
855 * as it is ok to set up the PCI bus without these files.
857 void pci_create_legacy_files(struct pci_bus *b)
861 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
866 sysfs_bin_attr_init(b->legacy_io);
867 b->legacy_io->attr.name = "legacy_io";
868 b->legacy_io->size = 0xffff;
869 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
870 b->legacy_io->read = pci_read_legacy_io;
871 b->legacy_io->write = pci_write_legacy_io;
872 b->legacy_io->mmap = pci_mmap_legacy_io;
873 pci_adjust_legacy_attr(b, pci_mmap_io);
874 error = device_create_bin_file(&b->dev, b->legacy_io);
878 /* Allocated above after the legacy_io struct */
879 b->legacy_mem = b->legacy_io + 1;
880 sysfs_bin_attr_init(b->legacy_mem);
881 b->legacy_mem->attr.name = "legacy_mem";
882 b->legacy_mem->size = 1024*1024;
883 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
884 b->legacy_mem->mmap = pci_mmap_legacy_mem;
885 pci_adjust_legacy_attr(b, pci_mmap_mem);
886 error = device_create_bin_file(&b->dev, b->legacy_mem);
893 device_remove_bin_file(&b->dev, b->legacy_io);
898 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
899 "and ISA memory resources to sysfs\n");
903 void pci_remove_legacy_files(struct pci_bus *b)
906 device_remove_bin_file(&b->dev, b->legacy_io);
907 device_remove_bin_file(&b->dev, b->legacy_mem);
908 kfree(b->legacy_io); /* both are allocated here */
911 #endif /* HAVE_PCI_LEGACY */
915 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
916 enum pci_mmap_api mmap_api)
918 unsigned long nr, start, size, pci_start;
920 if (pci_resource_len(pdev, resno) == 0)
923 start = vma->vm_pgoff;
924 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
925 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
926 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
927 if (start >= pci_start && start < pci_start + size &&
928 start + nr <= pci_start + size)
934 * pci_mmap_resource - map a PCI resource into user memory space
935 * @kobj: kobject for mapping
936 * @attr: struct bin_attribute for the file being mapped
937 * @vma: struct vm_area_struct passed into the mmap
938 * @write_combine: 1 for write_combine mapping
940 * Use the regular PCI mapping routines to map a PCI resource into userspace.
943 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
944 struct vm_area_struct *vma, int write_combine)
946 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
947 struct device, kobj));
948 struct resource *res = attr->private;
949 enum pci_mmap_state mmap_type;
950 resource_size_t start, end;
953 for (i = 0; i < PCI_ROM_RESOURCE; i++)
954 if (res == &pdev->resource[i])
956 if (i >= PCI_ROM_RESOURCE)
959 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
960 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
961 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
962 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
964 (u64)pci_resource_start(pdev, i),
965 (u64)pci_resource_len(pdev, i));
969 /* pci_mmap_page_range() expects the same kind of entry as coming
970 * from /proc/bus/pci/ which is a "user visible" value. If this is
971 * different from the resource itself, arch will do necessary fixup.
973 pci_resource_to_user(pdev, i, res, &start, &end);
974 vma->vm_pgoff += start >> PAGE_SHIFT;
975 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
977 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
980 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
984 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
985 struct bin_attribute *attr,
986 struct vm_area_struct *vma)
988 return pci_mmap_resource(kobj, attr, vma, 0);
992 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
993 struct bin_attribute *attr,
994 struct vm_area_struct *vma)
996 return pci_mmap_resource(kobj, attr, vma, 1);
1000 pci_resource_io(struct file *filp, struct kobject *kobj,
1001 struct bin_attribute *attr, char *buf,
1002 loff_t off, size_t count, bool write)
1004 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1005 struct device, kobj));
1006 struct resource *res = attr->private;
1007 unsigned long port = off;
1010 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1011 if (res == &pdev->resource[i])
1013 if (i >= PCI_ROM_RESOURCE)
1016 port += pci_resource_start(pdev, i);
1018 if (port > pci_resource_end(pdev, i))
1021 if (port + count - 1 > pci_resource_end(pdev, i))
1027 outb(*(u8 *)buf, port);
1029 *(u8 *)buf = inb(port);
1033 outw(*(u16 *)buf, port);
1035 *(u16 *)buf = inw(port);
1039 outl(*(u32 *)buf, port);
1041 *(u32 *)buf = inl(port);
1048 pci_read_resource_io(struct file *filp, struct kobject *kobj,
1049 struct bin_attribute *attr, char *buf,
1050 loff_t off, size_t count)
1052 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1056 pci_write_resource_io(struct file *filp, struct kobject *kobj,
1057 struct bin_attribute *attr, char *buf,
1058 loff_t off, size_t count)
1060 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1064 * pci_remove_resource_files - cleanup resource files
1065 * @pdev: dev to cleanup
1067 * If we created resource files for @pdev, remove them from sysfs and
1068 * free their resources.
1071 pci_remove_resource_files(struct pci_dev *pdev)
1075 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1076 struct bin_attribute *res_attr;
1078 res_attr = pdev->res_attr[i];
1080 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1084 res_attr = pdev->res_attr_wc[i];
1086 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1092 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1094 /* allocate attribute structure, piggyback attribute name */
1095 int name_len = write_combine ? 13 : 10;
1096 struct bin_attribute *res_attr;
1099 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1101 char *res_attr_name = (char *)(res_attr + 1);
1103 sysfs_bin_attr_init(res_attr);
1104 if (write_combine) {
1105 pdev->res_attr_wc[num] = res_attr;
1106 sprintf(res_attr_name, "resource%d_wc", num);
1107 res_attr->mmap = pci_mmap_resource_wc;
1109 pdev->res_attr[num] = res_attr;
1110 sprintf(res_attr_name, "resource%d", num);
1111 res_attr->mmap = pci_mmap_resource_uc;
1113 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1114 res_attr->read = pci_read_resource_io;
1115 res_attr->write = pci_write_resource_io;
1117 res_attr->attr.name = res_attr_name;
1118 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1119 res_attr->size = pci_resource_len(pdev, num);
1120 res_attr->private = &pdev->resource[num];
1121 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1129 * pci_create_resource_files - create resource files in sysfs for @dev
1130 * @pdev: dev in question
1132 * Walk the resources in @pdev creating files for each resource available.
1134 static int pci_create_resource_files(struct pci_dev *pdev)
1139 /* Expose the PCI resources from this device as files */
1140 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1142 /* skip empty resources */
1143 if (!pci_resource_len(pdev, i))
1146 retval = pci_create_attr(pdev, i, 0);
1147 /* for prefetchable resources, create a WC mappable file */
1148 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1149 retval = pci_create_attr(pdev, i, 1);
1152 pci_remove_resource_files(pdev);
1158 #else /* !HAVE_PCI_MMAP */
1159 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1160 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1161 #endif /* HAVE_PCI_MMAP */
1164 * pci_write_rom - used to enable access to the PCI ROM display
1166 * @kobj: kernel object handle
1167 * @bin_attr: struct bin_attribute for this file
1170 * @count: number of byte in input
1172 * writing anything except 0 enables it
1175 pci_write_rom(struct file *filp, struct kobject *kobj,
1176 struct bin_attribute *bin_attr,
1177 char *buf, loff_t off, size_t count)
1179 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1181 if ((off == 0) && (*buf == '0') && (count == 2))
1182 pdev->rom_attr_enabled = 0;
1184 pdev->rom_attr_enabled = 1;
1190 * pci_read_rom - read a PCI ROM
1192 * @kobj: kernel object handle
1193 * @bin_attr: struct bin_attribute for this file
1194 * @buf: where to put the data we read from the ROM
1196 * @count: number of bytes to read
1198 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1199 * device corresponding to @kobj.
1202 pci_read_rom(struct file *filp, struct kobject *kobj,
1203 struct bin_attribute *bin_attr,
1204 char *buf, loff_t off, size_t count)
1206 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1210 if (!pdev->rom_attr_enabled)
1213 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1220 if (off + count > size)
1223 memcpy_fromio(buf, rom + off, count);
1225 pci_unmap_rom(pdev, rom);
1230 static struct bin_attribute pci_config_attr = {
1233 .mode = S_IRUGO | S_IWUSR,
1235 .size = PCI_CFG_SPACE_SIZE,
1236 .read = pci_read_config,
1237 .write = pci_write_config,
1240 static struct bin_attribute pcie_config_attr = {
1243 .mode = S_IRUGO | S_IWUSR,
1245 .size = PCI_CFG_SPACE_EXP_SIZE,
1246 .read = pci_read_config,
1247 .write = pci_write_config,
1250 int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1255 static ssize_t reset_store(struct device *dev,
1256 struct device_attribute *attr, const char *buf,
1259 struct pci_dev *pdev = to_pci_dev(dev);
1261 ssize_t result = kstrtoul(buf, 0, &val);
1269 result = pci_reset_function(pdev);
1276 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1278 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1281 struct bin_attribute *attr;
1283 /* If the device has VPD, try to expose it in sysfs. */
1285 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1289 sysfs_bin_attr_init(attr);
1290 attr->size = dev->vpd->len;
1291 attr->attr.name = "vpd";
1292 attr->attr.mode = S_IRUSR | S_IWUSR;
1293 attr->read = read_vpd_attr;
1294 attr->write = write_vpd_attr;
1295 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1300 dev->vpd->attr = attr;
1303 /* Active State Power Management */
1304 pcie_aspm_create_sysfs_dev_files(dev);
1306 if (!pci_probe_reset_function(dev)) {
1307 retval = device_create_file(&dev->dev, &reset_attr);
1315 pcie_aspm_remove_sysfs_dev_files(dev);
1316 if (dev->vpd && dev->vpd->attr) {
1317 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1318 kfree(dev->vpd->attr);
1324 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1328 struct bin_attribute *attr;
1330 if (!sysfs_initialized)
1333 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1334 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1336 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1340 retval = pci_create_resource_files(pdev);
1342 goto err_config_file;
1344 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1345 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1346 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1349 /* If the device has a ROM, try to expose it in sysfs. */
1351 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1354 goto err_resource_files;
1356 sysfs_bin_attr_init(attr);
1357 attr->size = rom_size;
1358 attr->attr.name = "rom";
1359 attr->attr.mode = S_IRUSR | S_IWUSR;
1360 attr->read = pci_read_rom;
1361 attr->write = pci_write_rom;
1362 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1365 goto err_resource_files;
1367 pdev->rom_attr = attr;
1370 /* add platform-specific attributes */
1371 retval = pcibios_add_platform_entries(pdev);
1375 /* add sysfs entries for various capabilities */
1376 retval = pci_create_capabilities_sysfs(pdev);
1380 pci_create_firmware_label_files(pdev);
1386 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1387 kfree(pdev->rom_attr);
1388 pdev->rom_attr = NULL;
1391 pci_remove_resource_files(pdev);
1393 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1394 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1396 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1401 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1403 if (dev->vpd && dev->vpd->attr) {
1404 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1405 kfree(dev->vpd->attr);
1408 pcie_aspm_remove_sysfs_dev_files(dev);
1409 if (dev->reset_fn) {
1410 device_remove_file(&dev->dev, &reset_attr);
1416 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1417 * @pdev: device whose entries we should free
1419 * Cleanup when @pdev is removed from sysfs.
1421 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1425 if (!sysfs_initialized)
1428 pci_remove_capabilities_sysfs(pdev);
1430 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1431 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1433 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1435 pci_remove_resource_files(pdev);
1437 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1438 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1439 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1442 if (rom_size && pdev->rom_attr) {
1443 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1444 kfree(pdev->rom_attr);
1447 pci_remove_firmware_label_files(pdev);
1451 static int __init pci_sysfs_init(void)
1453 struct pci_dev *pdev = NULL;
1456 sysfs_initialized = 1;
1457 for_each_pci_dev(pdev) {
1458 retval = pci_create_sysfs_dev_files(pdev);
1468 late_initcall(pci_sysfs_init);
1470 static struct attribute *pci_dev_dev_attrs[] = {
1475 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1476 struct attribute *a, int n)
1478 struct device *dev = container_of(kobj, struct device, kobj);
1479 struct pci_dev *pdev = to_pci_dev(dev);
1481 if (a == &vga_attr.attr)
1482 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1488 static struct attribute *pci_dev_hp_attrs[] = {
1489 &dev_remove_attr.attr,
1490 &dev_rescan_attr.attr,
1494 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1495 struct attribute *a, int n)
1497 struct device *dev = container_of(kobj, struct device, kobj);
1498 struct pci_dev *pdev = to_pci_dev(dev);
1500 if (pdev->is_virtfn)
1506 static struct attribute_group pci_dev_hp_attr_group = {
1507 .attrs = pci_dev_hp_attrs,
1508 .is_visible = pci_dev_hp_attrs_are_visible,
1511 #ifdef CONFIG_PCI_IOV
1512 static struct attribute *sriov_dev_attrs[] = {
1513 &sriov_totalvfs_attr.attr,
1514 &sriov_numvfs_attr.attr,
1518 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1519 struct attribute *a, int n)
1521 struct device *dev = container_of(kobj, struct device, kobj);
1523 if (!dev_is_pf(dev))
1529 static struct attribute_group sriov_dev_attr_group = {
1530 .attrs = sriov_dev_attrs,
1531 .is_visible = sriov_attrs_are_visible,
1533 #endif /* CONFIG_PCI_IOV */
1535 static struct attribute_group pci_dev_attr_group = {
1536 .attrs = pci_dev_dev_attrs,
1537 .is_visible = pci_dev_attrs_are_visible,
1540 static const struct attribute_group *pci_dev_attr_groups[] = {
1541 &pci_dev_attr_group,
1542 &pci_dev_hp_attr_group,
1543 #ifdef CONFIG_PCI_IOV
1544 &sriov_dev_attr_group,
1549 struct device_type pci_dev_type = {
1550 .groups = pci_dev_attr_groups,